diff --git a/gns3server.bat b/gns3server.bat
index ff132074..b5448a41 100644
--- a/gns3server.bat
+++ b/gns3server.bat
@@ -1,2 +1,2 @@
-SET PYTHONPATH=.
-python.exe gns3server/main.py --debug --local
+SET PYTHONPATH=%~dp0
+python.exe %~dp0/gns3server/main.py --debug --local
diff --git a/gns3server/modules/qemu/qemu_vm.py b/gns3server/modules/qemu/qemu_vm.py
index e0355ded..077d7469 100644
--- a/gns3server/modules/qemu/qemu_vm.py
+++ b/gns3server/modules/qemu/qemu_vm.py
@@ -310,7 +310,7 @@ class QemuVM(BaseVM):
         :returns: QEMU hdb disk interface
         """
 
-        return self._hda_disk_interface
+        return self._hdb_disk_interface
 
     @hdb_disk_interface.setter
     def hdb_disk_interface(self, hdb_disk_interface):
@@ -773,7 +773,10 @@ class QemuVM(BaseVM):
                     priority = win32process.IDLE_PRIORITY_CLASS
                 else:
                     priority = win32process.NORMAL_PRIORITY_CLASS
-                win32process.SetPriorityClass(handle, priority)
+                try:
+                    win32process.SetPriorityClass(handle, priority)
+                except win32process.error as e:
+                    log.error('Could not change process priority for QEMU VM "{}": {}'.format(self._name, e))
         else:
             if self._process_priority == "realtime":
                 priority = -20